BunnyEars2.java

/*
We have bunnies standing in a line, numbered 1, 2, ... The odd bunnies (1, 3, ..) have the normal 2 ears. The even bunnies (2, 4, ..) we'll say have 3 ears, because they each have a raised foot. Recursively return the number of "ears" in the bunny line 1, 2, ... n (without loops or multiplication).
bunnyEars2(0) → 0
bunnyEars2(1) → 2
bunnyEars2(2) → 5
*/
public int bunnyEars2(int bunnies) {
  if(bunnies==0) return 0;
  if(bunnies%2==0) return 3+bunnyEars2(bunnies-1);
  return 2+bunnyEars2(bunnies-1);
}